Reports on the results of a study on the effects of nutrient enrichment on the Oregon spotted frog in the Conboy Lake National Wildlife Refuge. Makes recommendations for management based on the results.

Reports on the results of a study on the effects of Organochlorine contaminants on Double-crested cormorants from the Lewis and Clark National Wildlife Refuge in the Columbia River Estuary. Makes recommendations for ...

Reports on the results of a study on the effects of isotopic nitrogen on Oregon Chub in the Oakridge Slough of the Middle Fork Willamette River Drainage. Makes recommendations for addressing the problems identified.

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